Gas-washer.



T. MCDONALD.

GAS WASHER.

APPLICATION FiLED JUNE x 1912.

Patented Jan. 11, 1916 3 SHEETS-SHEET 1.

TUE.

INVENTOR WH'NESSES T. IVlcDONALD.

GAS WASHER.

APPLICATION HLED JUNE I, 1912.

- E'aten'te $1111.11, 1916.

3 SHEETS-'SHEET 2.

n'mzsszs '1'. MCDONALD.

GAS WASHER. APPLlCAHON FILED JUNE 1, 1912. v

. Patented Jan. 11, 1916.

3 SHEETS-SHEET 3 FIG. 3

wrrNEssEs iNVi-INTOR waif-m 7 I, I ,X i

. UNITED STATES PATENT OFFICE.

THOMAS MUDONALD, or YOUNGSTOWN, OHIO.

GAS-WASHER.

Application filed June 1,

' ticularly relates to the construction and arrangement of a wet gaswashing apparatus in which blast furnace" gases are caused to impinge onthe surface of a pool or series of pools of'a fluid such as water in thegas cleaning operations.

One-object of myinvention is to provide a gas washer of improvedconstruction hav ing novel means; whereby the gases are brought intocontact with the water or other .-fluid used in removing the finelydivided solids carried in suspension in the gases,

and by which the surface of the water or other fluid within the washeris kept clean and in condition for eifectively removing the solidmaterials from the constantly fiow ing stream of gases impingingthereon.

washer is effected and the flue Another object of my invention is toprovidea gas washer having improved means whereby the tendency flowingthrough the cause the reentry into the gases of deposited solids islessened and reduced.

A further object of the invention is to provide a gas Washer having,improved means whereby the removal of the deposited solids from the gaswasher is facilitated.

A still further object of this invention is to provide a gas washerhaving improved means whereby the separation of the water and the finelydivided solids collected therein from the gases passed through the gasdust or other solids in the water are recovered.

Still further objects of the invention will appear as the invention ismore fully de-' scribed and claimed hereinafter.

Referring to the accompanying drawings forming part of thisspecification, Figure l is a plan showing agas washer" constructed andarranged in accordancewith mv invention. Fig. 2 is a longitudinalsectional side elevation of the apparatus shown in Figs. 1

Specification of Letters Patent.

. let main connected by of the stream of gases washer to pick up or-"Patented. Jan. 11, 1916. 1912. Serial No. 709,954.

and 2. Fig. 3 is a sectional end elevation of the same, the section'being taken on the irregular line III-III of Fig. 2.

In the drawings Qdesignates the gas in one end to the upper end ofaspray tower 3, the lower end of the spray tower being connected to oneend of the cover or top a of the horizontal gas washer and outlet main 5is connected to the opposite end of the top 4, f thewasher.

A series one end of an uptake or gas of spray pipes 6 are provided inthe upper end-of the spray tower 8-, each having a series ofperforations therein, by means of which water in the form of a rain orspray is caused to descend through the spray tower and by mixing withthe incoming gases carry therefrom finely divided solids carried insuspension in the gases. cover 4, which as shown is semi-cylindrical incross section, is secured by posts or supports 7 located at intervals inthe length of the cover 4 to the trough or'bottom'sect'ion 8 of thehorizontal impingement washer.

The bottom section 8 of the impingement washer is formed of a series ofpockets 9, 10, 11, 12,

ing formed with downwardly and inwardly sloping sides, eachbeingconnected at their converging lower ends to cleaning outlets 16,the outlets being closed normally by means of sealing bells 17. Thesealing bells 17 are secured to the gas washer by means ofcounter-weighted lever arms 18,v which are at an intermediate point intheir length connected to the bottom of the washer.

The well known construction of the clean- ,ing outlets, the bellstherefor, and the bell operating levers,- not forming part of thisinvention, is not further described. 1

Dependingwithin the cover or top 4. of the horizontal gas washer arebaflies 19 which extend transversely across the width of the top 4 andsecured in the bottom section '8 of the horizontal washer are upwardlyextending partitions 20, which likewise extend transversely across-thewidth of the gas washer. The depending bafiies l9 alternate with theupwardly extending partitions 20 and the lower horizontal edges 2l'ofthe baiiies 19 are some distance below the level of the upper marginaledges 22 of the partitions 20. The horizontal distance between thebaffles 19 and the partitions 20 passing under the ba water in the gasWe in operation,

on the left hand or gas entering side of the partitions 20 is greaterthan the corresponding, distance between the partitions 20 andthe righthand or gas disbafiles 19 on charge side of the partitions. The baflies19 and partitions 20 are spaced so that the area between the bafiles andpartitions through which the ascending-columns of 1 gases rise to passover the partitions 20 is 10* ater than the area of they portions of thewasher for descendingl columns. of the gases es 19', soas toin this waylessen and overcome the tendency of the gases to'pick up or cause thereentry into the gases of finely divided solids depositedtherefrom'usplon the surface of the By referenceto Fi seen the lowermarginal side edges 23 of the semi-circular top 4, forming the cover forthe horizontal as washer are arranged to extend'downwar y within thelower section .8 of the washer to a point below the lowest level atwhich the water is maintained within .the gas washer when the washer isin such manner as to provide openings which extend lengthwise along each'side of the washer between the lower marginal edges ofthe cover or topi and the adjoining surfaces of the bottom section 8 of the washer,the'top A beingnarrower than the bottom 8. In this way the water in thegas. washer is arranged to form a water seal so as to normally preventescape of the gases from the washer into the at- .fmosphere through theside openings formed between i top-4 and the 'upper edges 24. of thebottom cases. of excessive pressure beingformed Milo! sueeessively lowerlevels for the. fluid section 8 of the washer. The sideopenings also actto form a relief or safety valve in the washer as for example that oc-'oned by slips in the blast furnace to which thegas. washer isappliedfor use, excessive pressure'forcing the water out of the washer andallowing the escape of the. ggsels into the atmosphere until thepressureo t e gases again becomes normal. The owe'r edge of theartitions 20 with the upper edges cr -the of he pockets 10 and 11, Hand12, etc. form narrow transversely extendin slots ior ggenings 25, 26, 27and- 28, and the. upper go o thead1oining sides of the pockets 10 and 11defining the lower side ofthe slot 25 'is .slightl higher than thecorresponding'edgle o the sides of the pockets 11 and 12. he marginal.'edge of the ad- ..jacent. sides of the pockets 11 and-l2 is. slightlylower-than the corresponding part of the adjacent sides of the pockets10 and 11, and the upper. marginal edge of the succeed1ng plocketslikewise are successively lower wt in the gas washer, so that a seriesgs. '2 and 3, it will be progressively smaller so washeris provided thelower marginal edges 23 of the v a trough nected by -to a drain 41leading to a sewer or other the.

a jacent side. walls.

are maintained within the gas washer. The lower edge 29 of the end ofthe top 4 of the washer extends downwardly within the bottom section 8of the washerto thesame 7 level as the side edges 23 of the top 4. Thepockets 9, 10, 11, etc. from left to right also decrease in sizesuccessively so that the ocket 10 is somewhat smaller than the pocket 9and the pocket 15, which is located at the discharge end of the gasasher, is

of substantially smaller size than he largest pocket 9 (the one locatedclosest to the inlet end of the gas washer). The greatest amount of dustor other finely divided solids being. deposited in the first of thepockets and the amount deposited in the last pocket being materiallyless, the pockets are made that, in this way,

each pocket will become about filled with flue dust in a given period oftime.

An overflow outlet 30, which determines the normal level of the waterwithin the pocket 15, is provided at the discharge end of the washer anda sluice 31, which is her- I mally closed by the sluice gate 32 islocated on the discharge end of thewasher at a lower level than theoverflow outlet 30,11 trough 33 leading the water discharged therefrominto the drain 34.. The sluice gate 32 is connected to one end of theoperating handle 35 on the washer by which the gateis opened and closed.

' The cover or top 4 for the horizontal. gas with manholes 36,- whicharenormally closed'by means of manh'ole covers 37. Below'the gas washeris a sump 38 having 39 extending lengthwise along on side thereof, thetrough 39 being somewhat deeper than the sump 38. and beingconashallower trough ordain 40 place ofdischarge for the waste water.

In the operation of my improved 'appa-y ,2 into the upper end of thesprayftowerfl in the pockets 9 and 10 and are caused to rise upwardlyand pass around the first of the partitions 20 and then in under andaround the first depending baflie 19. The

column of gases is'c'aused to travel through a tortuous path by means ofthe baflles 19 and partitions 20, the gases descending and impin 'ng' onthe surface of the water and ascen mg to pass over a partition 20 untilthe opposite end of the horizontal washer is 6 in the top of the spray1m'prored construction the reached, when the 'wa-rdly and pass out thegas ofttake -5.

The heaviest particles of the solids in the cleaned gases rise upor theWasher through gases, which are wetted in the spray tower of gases onthe water so thatfunless re -moved as formed, this scunr'retards thecleaning effect of the water and lessens the efiiciency of the washer.-By means of my scum .as formed will be carried by the water flowing overthe upper edges ofthe pockets through the slots or'transverse openings26, etc, into the last pocket 15, .in. this way keeping the surface ofthe water comparatively clean and free from scum.

After the washer has been in operation for a suflicient length of timeas to necessitate cleaning of the pockets in the'bottom' 8 of thewasher; the sluicegate is opened and the major portion-of the water inthe pocket 15 is drained oif this operation also removingthe accumulatedscum collected in the bell 17 on the on each pocket 9, 10, so as toempty the small amount of water then remaining in each pocket beingsufiicient to carry the sludge or pasty mixture of water and solids outof the pockets last pocket 15. The cleaning cleaning opening 16 etc., isthen opened. pocket, the relatively through the cleaning outlet 16 intothe sump 38. As the sump 38 becomes filled with the mixture of water andfinely divided solids from the pockets of the gas washer, the watertherein will flow over the dam 40 and the solid materials. being heavy,will become deposited within the sump 3S and deeper trough 39, the waterpassing over the dam 40'fiowing into the drain 4-1 which leads to thesewer or other point of dis posal. The finely divided solids or fluedust deposited in the sump, 3S and trough 39 will be removed from timeto time in a condition in readiness to be stored. for future use, andthe amount of flue dust or solid materials car'ied away by the water incleaning the washer will be 'very materially reduced.

v The advantages of my invention will be apparent to those skilled inthe art. The

blast furnace or other combustible gases be ing cleaned are intimatelymixed with water introduced thereinto in a spray and the gases are thencaused to repeated impinge upon the surfares of the water in thesuccessive pockets of the gas washer. The scum as formed on the surfacethe water is automatically carried from one pocket to finer particles ofthe solids again used or the next by the c urrent ofwater constantlyflowing through the washer from one to the adjoining pocket, face of thewater contact WVltll the fresh gases entering the washer.

The arrangement tions so as passages for the est provides and in thiswaythe suris kept clear and free to of the battles and partito formpassages in which the ascending gases are smallmeans whereby reentry ofsolids on the surface of the water into the gases passing through thewater is prevented and overcome.

The arrangement of a series of separate and independent pockets in whichthe solids are deposited provides means 'for-cleaning one portion or thewasher independently of the other with a. minimum waste of water.

The sump and the beneath the ga means for separating water dischargedfrom arrangement of troughs s washer provide novel the flue dust and the-washer and lessen and overcome the loss of large quantities of finedust heretofore iarried away by the waste water.

Modifications'in the construction andarrangement of the out departing inthe claims.

I claim 1. A gas washer comprising a washing chamber havin ings thereinand gas inlet and outl t open having means for supplying liquid thereto,means .for maintaining separate pools of a partition in sait mit passageof l cha gases in the upper portion of liquid in the chamber, and

mber arranged to perthe chamber. said )artition havin a transverseopening in the lower portion thereof arranged to permit passage ofliquid and gases past said partition and maintain the pools at successivchamber.

ely lower levels within the A gas .washer comprising a washing chamberhaving ings therein and ing liquid thereto, separate pools of liquid inSaid an upwardly extending chamber alternating with gas inlet and outletopenhaving means for supplymeans for maintaining chamber partition inthe a downwardly extending bathe depending from the top of the chamberand arranged to permit passage of gases over the partition and under thebathe,

said partition h lower portion thereof passage of liquids and to theother aving an'opening in the arranged to permit gases from one side ofthe partition, said opening forming an overflow outlet to determine thelevel of the liquid therein.

3. A gas washercomprising a washing chamber having ings therein and ungliquid tiereto. means gas inlet and outlet openhavmg means for supply-Ior maintaining separate pools of liquid in the chamber, a

plurality of upw ardly extending partitions wardly extending bafiiesdepending from the having gas inlet and outlet openings therein ofliquids from one top of said chamber, said partitions and baflles beingarranged to permit passage of gases over the partitions and under thebaffles, and said partition having openings forming overflow outlets in,,the lower portion thereof arranged to permit passage of liquid andgases from one side tothe other of the partition and regulate the heightto which the liquid is maintained in said pools at successively lowerlevels.

4. A gas washer comprising a washing chamber having gas inlet and outletopenings'the'rein and having means for supply ing liquid thereto,separate pools of liquid therein, a series of upwardly extendingpartitions and depending baflies in said chamber, saidbaffles beinglocated between the partitions and the partitions terminating below thetop'of the chamber and having transverse openings in the lower portionthereof forming passages for liquid and gases through the partitionsand' an overflow outlet opening for the liquids; a a

5. A gas washer comprising a chamber and having means for supplyingliquid thereto, a plurality-of upwardly extending partitions, in thechamber, a plurality of downwardly extending bafiles in said chamher,said, partitions and ba'fiies being relatively arranged'to permitpassage of gases over the partitions and under the baiiles, saidpartitions having openings in the lower portion thereof arranged topermit passage side/to the other of the upwardly extending bafiies, thelower marmeans for maintaining ginal edge of said openings being tsively lower levels.

6. A gas'washer comprising a washing chamber having gas inlet and outletopenings therein and having means for supplying liquid therito, meansfor maintaining separate pools of liquid therein, a series of upwardlyextending partitions and depending baliles in said chamber, said bafliesbeing located between the partitions and the partitions terminatingbelow the top of the chamber and having transverse openings in the lowerportion thereof forming passages for liquid and gases through thepartitions, and a sluice having a closing gate thereon below the levelof said overflow outlet openings. Y I

7. A gas washer comprising a washing chamber having a gas inlet andoutlet opening therein, and having means for supplying liquid thereto,means for maintaining separate pools of liquid therein, a series ofupwardly extending partitions and depending baflies in said chamber,said baffles being located between the partitions, to form compartmentslarger on the gas receiving side than on the gas discharging sidethereof,

and the partitions terminating below the top of the chamber and havmgtransverse openings 'in the lower portion thereof forming a passage forliquid and gases through the partitions at the level of the liquid.

In testimony whereof, I have hereunto set my hand.

' THOMAS MCDONALD.

WVitnesses: v

\VAnnnN F. PERRY, H. JAMES LITTLE.

